使用猫鼬在 MongoDB 图集中保存数据时出错

Question

I'm trying to save data in the MongoDB atlas with node.js and mongoose.

Every time I use MySchema.save() , Data is inserting But I'm also getting the error:

UnhandledPromiseRejectionWarning: MongoWriteConcernError: No write concern mode named 'majority;' found in replica set configuration

Also, there is no duplicate entry, Data is also inserting But I'm also getting the error

let User = require('../models/users.models');

const username = req.body.username;
const newUser = new User({username});
newUser.save()
.then(() => res.json('user added!'))
.catch(err => res.status(400).json('Error: ' + err));

User model

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

var userSchema = new Schema({
    username:  {
        type: String,
        required: true,
        unique: true,
        trim: true,
        minlength: 3
    },
  },
  {
    timestamps: true
  });

const User = mongoose.model('User', userSchema);

module.exports = User;

Answer 1

I know it was asked 2 months ago, but for those who will encounter the same issue. You are mistakenly entering a wrong char at the end of the URI string:
mongodb+srv://${ user }:${ password }@track-mkahl.mongodb.net/test?retryWrites=true&w=majority;
You need to delete the ; after the word majority .

Answer 2

This helped me.

 const schema = new Schema({ name: String }, { writeConcern: { w: 'majority', j: true, wtimeout: 1000 } });

https://mongoosejs.com/docs/guide.html#writeConcern

Answer 3

"mongoURI" : "mongodb+srv://${ user }:${ password }@cluster0.mde0j.mongodb.net/cluster0?retryWrites=true&w=majority "

我在 default.json 中遇到了同样的错误，它的简单错误只是在最后删除&w=majority部分，它将被解决

Answer 4

对我来说，它也在 URI 字符串中，就像@Yossi Saadi 所建议的那样，只是我在那里写了majoritys而不是majority

Answer 5

I think there's something wrong with this line.

let User = require('../models/users.models');

I have created a solution for you.

/models/user.js

const mongoose = require('mongoose')
const Schema = mongoose.Schema
mongoose.connect("mongodb://localhost/stack-overflow", { useNewUrlParser: true })

var userSchema = new Schema({
    username:  {
        type: String,
        required: true,
        unique: true,
        trim: true,
        minlength: 3
    },
  },
  {
    timestamps: true
  });

const User = mongoose.model('User', userSchema);

module.exports = User

/routes/userroute.js

const User = require("../models/user")
// Imagine run() as an asynchronous request handler
async function run() {
    try {
        const user1 = new User({ username: "lidafafnus" })
        user1.save((err,result) => {
            console.log(err, result)
        })
    } catch(error) {
        console.log(error)
    }
} 

run()